Wireless mobile communications has been developing very fast [1]}, [2]}, [3]}, [4]}, [5]}. The fifth generation (5G) mobile systems have been started to be deployed worldwide. Due to the broadcast nature of wireless media, information security has been a critical issue in wireless communication. The traditional method of addressing communication security is to adopt the secret key encryption. The secure transmission of private data is achieved by designing various encryption algorithms in the upper protocol stack. However, cryptography is of computational security and its security level depends on the hardness of the underlying mathematical problem it employs. Once an effective method is found to solve its mathematical problem, the security of the encryption method will be seriously compromised [6]}.
